Abstract: An in-situ observation device for gas hydrates includes a reactor, which includes a visual tube, a pulling rod, a temperature-controlled seed crystal rod and a spiral adjuster. An upper end and a lower end of the visual tube are respectively equipped with an upper end cap and a lower end cap. The upper end cap defines an air inlet, and the lower end cap defines a liquid inlet. An upper end of the temperature-controlled seed crystal rod is connected to an adjusting flange. The adjusting flange is connected to the spiral adjuster. A lower end of the temperature-controlled seed crystal rod hermetically passes through the upper end cap and is located in the visual tube. The temperature-controlled seed crystal rod defines a cooling liquid channel, and a cooling liquid inlet and a cooling liquid outlet, a seed crystal rod liquid inlet and a seed crystal rod outlet.

Abstract: A low-frequency acoustic wave generating device for detecting pipeline blockage related to the technical field of pipeline detection is provided and includes a sealing shell configured to be communicated with a pipeline, a sealed pressure environment is formed inside the sealing shell. A low-frequency electroacoustic transducer is disposed inside the sealing shell, the low-frequency electroacoustic transducer is connected to a signal generator and is configured to transmit an acoustic wave into the pipeline. The device transmits the acoustic wave signals to a high-pressure gas pipeline, combined with a signal generator capable of generating any waveform, thereby emitting any waveform of acoustic wave signal into the pipeline. The use of acoustic waves with special markings and characteristics for pipeline blockage detection can improve the anti-noise interference ability of the acoustic wave detection, and improve the precision of the detection.

Abstract: An ultramicro circuit board based on an ultrathin adhesiveless flexible carbon-based material and a preparation method thereof. The method comprises the steps of: S1. depositing to form a PI film on a surface of a quantum carbon-based film through a chemical vapor deposition (CVD) reaction, and manufacturing a flexible circuit board base material with a quantum carbon-based film/PI double-layer composite structure; and S2. manufacturing a high-frequency ultramicro circuit antenna on the flexible circuit board base material through a laser scanning etching method. The preparation method has the advantages of being good in environmental friendliness, high in efficiency, low in manufacturing cost and the like, and the manufactured antenna ultramicro circuit board has the advantages of being high in thermal and electrical conductivity, ultra-flexible, low in dielectric, low in loss and high in shielding performance, which can be applied to 5G equipment.